opportunities. it's a big mistake. that is the natural resource of all natural resources, the most important of all, what's up here, ideas, ingenuity, foresight, all of that. training. we ought to be, as canada is being, we ought to be a place they all want to be and come on over, we need you. what would we be without immigration? think of who would never have become an american without immigration. that's who we are, thank goodness. >> powerful words. david mccullough. thank you. we will be right back to talk about a time when america and americans were fascinated by france. david mccullough's new book when we come back. ♪ let me entertain you ♪ let me make you smile ♪ let me do a few tricks ♪ some old and then some new tricks ♪ ♪ i'm very versatile ♪ so let me entertain you ♪ and we'll have a real good time ♪ [ male announcer ] with beats audio and flash, you can experience richer music and download movies straight to the new hp touchpad with webos. really? 25 grams of protein. what do we have? all four of us, together? 24. he's low fat, too, and has 5 grams of sugars. i'